Micrometer caliper



Jan. 3, 1928. 1,654,843 7 E. C. SPARKS V MI CROMETER CALIPER Filed March 31, 1927 Patented Jan. 3,1928;

UNITED STATES PATENT OFFICE.

EARL C. SPARKS, OF CRANSTON, RHODE ISLAND, ASSIGNOR TO BROWN & SHARPE MFG. 00., OF PROVIDENCE, RHODE ISLAND.

MICROMETER CALIPER.

Application filed March 31, 1927. Serial No. 179,860.

This invention relates'to micrometer calipers and is an improvement upon Patent No; 717,296, issued December 30, 1902.

The primary object of the invention is to improve the mechanism' for effecting compression of the spindle engaging ring employed for the purpose of locking the latter, thereby to more efi'ectually maintain the accuracy of the measurement to be taken.

A further object of the invention is to provide a structure wherein the spindle clamping mechanism can be more easlly and quickly and consequently economically produced.

In the drawings Figure 1 is a side elevation of a micrometer caliper to which the present invention is applied v Figure 2 is an enlarged detail sectlonal view; and

Figure 3 is a section on line 3-3 of Fig. 2.

In the drawings, frame of thecalipers having the anvil 2 and spindle 3, the spindle being mounted in the bearing 4. In proceeding in accordance with the present invention, the bearing 4 is provided with a groove to receive the clamping ring 5 which latter is split as indicated at 6 and is provided with an arcuate projection 7. The projection 7 engages in a substantially L-shaped seat 8 provided therefor in the bearing 4. An actuating ring 9 encirclesthe split clan'iping ring 5 and on its inner circumference is provided with a cutout forming substantially L-shaped seat '10 which latter is eccentric to the actuating ring 9. The clai'nping ring 5 is provided with a cut out forming a tangentia'l seat 11 l which latter confronts the seat 10 and cooperates therewith. In this manner, it will be seen that inclined seats having a wedge-like relation are provided for a roller 12 which latter is engaged with and between the seats. In order'to increase the resilience of the end 13 of the clamp ring, the latter is provided with a cut-out 14, so that the roller is locked between the end 18 and the cut-out 14:.

By virtue of the provision of the inclined seats, it will be apparentthat the same may not only be more easily vformed, owing to the diminutive size of the parts, but also a more effective and quicleresponsive clamping 1 indicates the usual of the ring 5 against the spindle is'had. In addition, it will be noted that the roller is confined between two stops 16 and 17 which latter exist by virtue of the formation of the respective wedge-shaped seat-s.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is e 1. In a micrometer caliper having a frame and a spindle, clamplng means for locking vthe spindle including a split ring having an inclined seat on its periphery adjacent one end ofthe ring and having a cut-out adjacentto the seat, an actuating ring encircling the split ring and having an inclined seat which confronts the first named seat and a roller engaged with and between the seats so that the seats have a wedge-like relationu I V 2. In a micrometer calipers having a frame and a spindle, clamping means for locking the spindle including a split ring having a substantially L-shaped seat on its 7 periphery adjacent one end of the ring, an actuating ring encircling the split ring and having a substantially L-shaped seat on its inner circumference disposed oppositely to the first named seatwhereby the inner ends of the seats form a pair of spaced confronting stops, said seats having a wedge-like relation, and a roller engaged with-the seats and in the space between the stops.

3. In a micrometer calipers having a 8 frame and a spindle, clamping means for locking the spindle including a split ring having a substantially L-shaped seaton its periphery adjacent one end of the ring, an actuating ring encircling the split ring and having a substantially L-shaped seat on its inner circumference disposed oppositely to the first named seat whereby the inner ends of the seats form a pair of spaced confronting stops, said seats having a wedge-like relation, and a roller engaged with the seats and in the space between the stops, the split ring having a cut-out adjacent its seat and spaced from the inner end of said seatof the split ring. i 1

In testimony whereof I have signed my name to this specification.

EARL C. SPARKS. 

